Why is Nuclear Power Huge ?

The Energy that binds together the nucleus of an atom is huge , even THOUGH THE NUCLEUS IS MINUTE. In Fact, as Einstein showed in 1905 with this theory of Special Relatively , the particles of the atom can be regarded as pure energy from millions of atomic nuclei that allow nuclear power stations to generate so much power from just a few tons of nuclear fuel. It also gives nuclear bombs their terrifying destructive power.